add namesapce to telemetry for allocation

[tantra35]

In new versions of nomad really id of job consist from two parts namspace and Job name, but in telemetry this fact doesn't respected. And metric name looks like this:

nomad.client.allocs.<Job>.<TaskGroup>.<AllocID>....

but it must looks like this

nomad.client.allocs.<Namespace>.<Job>.<TaskGroup>.<AllocID>....

[notnoop]

Thanks @tantra35; that's a good point. I believe this was resolved in by #5847 and was release in 0.9.4.

We opted to use a label instead of a metric name component because of backward compatibility concerns.

Closing this ticket, but please reopen and let us know more details if you see any unexpected behavior.

[github-actions]

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